uniq命令的作用：显示唯一的行，对于那些连续重复的行只显示一次！

接下来通过实践实例说明：[root@stu100 ~]# cat testboy took bat homeboy took bat homegirl took bat homedog brought hat homedog brought hat homedog brought hat home看test文件的内容，可以看到其中的连续重复行[root@stu100 ~]# uniq testboy took bat homegirl took bat homedog brought hat homeuniq命令不加任何参数，仅显示连续重复的行一次[root@stu100 ~]# uniq -c test2 boy took bat home1 girl took bat home3 dog brought hat home-c 参数显示文件中每行连续出现的次数。[root@stu100 ~]# uniq -d testboy took bat homedog brought hat home-d选项仅显示文件中连续重复出现的行。[root@stu100 ~]# uniq -u testgirl took bat home-u选项显示文件中没有连续出现的行。[root@stu100 ~]# uniq -f 2 -s 2 testboy took bat home忽略每行的前2个字段，忽略第二个空白字符和第三个字段的首字符，结果at home[root@stu100 ~]# uniq -f 1 testboy took bat homedog brought hat home忽略每行的第一个字段，这样boy ，girl开头的行看起来是连续重复的行